| Rockwell PPS-4
|
|
| Rockwell PPS-4 found in the PC-1001 programmable calculator. PPS-4 (part 10660) on the upper-right corner along with the 10706 clock generator, GP I/O 10696, ROM (A05xx), RAM (10432), and a 7400 series 74154 decoder.
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| Developer |
Rockwell International
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| Manufacturer |
Rockwell International
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| Production |
August, 1972-1981
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| Architecture |
4-bit words, 8-bit instruction
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| Word size |
4-bit "-bit" is not declared as a valid unit of measurement for this property.
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| Clock |
198.864 kHz
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| Package |
QIL42
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The PPS-4 (Parallel Processing System - 4-bit word) was a family of 4-bit microprocessor chips designed by Rockwell International and introduce in 3rd quarter of 1972.
The original PPS-4 chipset was designed to provide complete functionality in three chips - CPU, program memory, and a clock generator. A later version known as the PPS-4/2 ("/2" denoting a two-chip system) eliminated the external clock generator chip by incorporating it internally. A third variation known as the PPS-4/1 ("/1" being a single-chip microcomputer) was actually a microcontroller, including the program memory internally.
Members
PPS-4/1 microcontrollers
Rockwell expanded the family by introducing the PPS-4/1 which is a microcontroller incorporating the PPS-4 CPU, the program memory, and clock generator internally. The PPS-4/1 were considerably slower than their multi-chip counterparts, operating at only up to half of their frequency (40 KHz-100 KHz).
| Part |
RAM |
ROM |
I/O Ports |
Notes
|
| MM75 |
48x4 bits |
640x8 bits |
22 |
Reduced I/O
|
| MM76 |
48x4 bits |
1024x8 bits |
31 |
|
| MM77 |
96x4 bits |
1344x8 bits |
31 |
|
| MM78 |
128x4 bits |
2048x8 bits |
31 |
|
Design
Instruction set
Documents
